#pragma once
// mm_phys.h - physical memory manager (PMM)
// Stack allocator over 4 KB frames, seeded from MEMORY_MAP.
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <memory_map.h>

#define PAGE_SIZE   4096ULL
#define PAGE_MASK   (~(PAGE_SIZE - 1))

typedef uint64_t PHYSICAL_ADDRESS;

// Called once by KernelMain with the MEMORY_MAP from BOOT_INFO.
bool             MmInitializePhysical(const MEMORY_MAP* map,
                                      uint64_t physicalWindowBase);

// Allocate / free a single 4 KB frame.
// MmAllocateFrame returns 0 on failure.
PHYSICAL_ADDRESS MmAllocateFrame(void);
void             MmFreeFrame(PHYSICAL_ADDRESS frame);

// Allocate 'count' physically contiguous 4 KB frames.
// Returns 0 on failure. Use sparingly (DMA, page tables).
__declspec(dllexport) PHYSICAL_ADDRESS MmAllocateContiguous(size_t count);

size_t           MmFreeFrameCount(void);
size_t           MmTotalFrameCount(void);